Waste acid treatment system and method

A treatment method and a treatment system technology, applied in the field of sewage acid treatment system, can solve the problems of bad shape of gypsum slag, high acidity of sewage acid treatment, difficulty in slag dehydration, etc., and achieve comprehensive utilization, good quality and optimized The effect of the smelting process

Active Publication Date: 2014-09-17
KUNMING ENG & RES INST OF NONFERROUS METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The acidity of sewage acid treatment is relatively high, and quicklime is generally used for treatment, which requires a large amount of quicklime, which requires a large amount and high cost;
[0005] 2. The gypsum slag produced by the sewage acid treatment system is not good in shape, has many impurities, and has a large content of crystal water, making it difficult to dehydrate the slag

Method used

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  • Waste acid treatment system and method
  • Waste acid treatment system and method

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Experimental program
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Effect test

Embodiment 1

[0033] Such as figure 1 As shown, a sewage acid treatment system includes a sewage acid regulating tank connected in sequence, a sewage acid lift pump, a primary neutralization tank, a secondary neutralization tank, a thickener, a first filter press feed pump, a stage A filter press, a slurrying tank, a second filter press feed pump, and a second-stage filter press, the thickener, the first-stage filter press, and the second-stage filter press are respectively connected to an ordinary acid wastewater regulating tank.

[0034] The present embodiment is based on the dirty acid treatment method of the above-mentioned dirty acid treatment system, comprising the steps of:

[0035] Step (1): The sewage acid is lifted into the first-level neutralization tank by the lifting pump, and the dirty acid flows to the second-level neutralization tank by itself, and limestone slurry is added to both the first-level neutralization tank and the second-level neutralization tank to adjust the se...

Embodiment 2

[0039] Such as figure 1 As shown, a sewage acid treatment system includes a sewage acid regulating tank connected in sequence, a sewage acid lift pump, a primary neutralization tank, a secondary neutralization tank, a thickener, a first filter press feed pump, a stage A filter press, a slurrying tank, a second filter press feed pump, and a second-stage filter press, the thickener, the first-stage filter press, and the second-stage filter press are respectively connected to an ordinary acid wastewater regulating tank.

[0040] The present embodiment is based on the dirty acid treatment method of the above-mentioned dirty acid treatment system, comprising the steps of:

[0041] Step (1): The sewage acid is lifted into the first-level neutralization tank by the lifting pump, and the dirty acid flows to the second-level neutralization tank by itself, and limestone slurry is added to both the first-level neutralization tank and the second-level neutralization tank to adjust the se...

Embodiment 3

[0045] Such as figure 1 As shown, a sewage acid treatment system includes a sewage acid regulating tank connected in sequence, a sewage acid lift pump, a primary neutralization tank, a secondary neutralization tank, a thickener, a first filter press feed pump, a stage A filter press, a slurrying tank, a feed pump of the second filter press, and a second-stage filter press, the thickener, the first-stage filter press, and the second-stage filter press are respectively connected to an ordinary acid wastewater regulating tank.

[0046] The present embodiment is based on the dirty acid treatment method of the above-mentioned dirty acid treatment system, comprising the steps of:

[0047]Step (1): The sewage acid is lifted into the first-level neutralization tank by the lifting pump, and the dirty acid flows to the second-level neutralization tank by itself, and limestone slurry is added to both the first-level neutralization tank and the second-level neutralization tank to adjust ...

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Abstract

The invention provides a waste acid treatment system and method, and belongs to the technical field of water treatment. The system includes a waste acid adjusting pool, a waste acid lifting pump, a first neutralization tank, a secondary neutralization tank, a thickener, a first pressure filter feed pump, a first-stage pressure filter, a slurrying tank, a second pressure filter feed pump and a secondary-stage pressure filter which are connected in turn, and the thickener, the first-stage pressure filter, and the secondary-stage pressure filter are respectively connected with a normal acid wastewater regulation tank. The system uses limestone powder slurry or lead oxide slurry prepared from limestone or lead oxide dust for waste acid treatment, the cost of (300-70) * 200 * 12 = 552000 yuan can be save each year according to the monthly lime use amount of 200t, the lime price of 300 yuan / t, the limestone price of 70 yuan / t, slurrying washed gypsum residue is smooth in appearance, water soluble arsenic and other harmful impurities can be washed away, the quality is better, and the washed gypsum residue is more conducive to the comprehensive utilization.

Description

[0001] technical field [0002] The invention relates to a sewage acid treatment system and method produced by metal smelting, belonging to the technical field of water treatment. Background technique [0003] Sulfuric acid will be produced in the sulfuric acid section of the lead-zinc smelter. The sulfuric acid concentration is about 6-9g / L, and it also contains a certain amount of As, F, Cl, Cd, Zn and other components. The traditional process generally uses quicklime for neutralization, and the generated waste residue is sent to the slag yard for stockpiling or a small amount of takeaway after pressure filtration and dehydration, and the filtrate is sent to the ordinary acid wastewater treatment system for treatment, which will bring the following disadvantages: [0004] 1. The acidity of sewage acid treatment is relatively high, and quicklime is generally used for treatment, which requires a large amount of quicklime, which requires a large amount and high cost; [0005...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 谢朝晖梁可谢益民袁世一
Owner KUNMING ENG & RES INST OF NONFERROUS METALLURGY
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